Mark Ruffalo placed on US terror advisory watch list

Hollywood actor Mark Ruffalo has been included in the US terror advisory watch list after he promoted a documentary about the effects of natural gas drilling.

The 43-year-old actor was placed on the watch list by Pennsylvania's Office of Homeland Security after he arranged screenings for the Gasland documentary, reports the Telegraph.

The film won the special jury prize at this year's Sundance Film festival and chronicles how communities have been affected by a boom in natural gas drilling.

In Pennsylvania the film, written and directed by Josh Fox, shows a resident who is able to set fire to his tap water.

Ruffalo, who has starred in films including Shutter Island, The Kids Are Alright and Eternal Sunshine of the Spotless Mind, told GQ magazine that his inclusion on the list was "pretty funny."